How many years can i sign up for the army after high school?

You can sign up for various lengths of service in the Army after high school, ranging from 2 to 6 years. However, many contracts initially involve an 8-year commitment, with some portion of that being in the Reserves or National Guard if you don't choose a full 2-6 year active duty contract. The exact length you can sign for will depend on the specific job/MOS (Military Occupational Specialty) you choose and the needs of the Army at that time. Speak to a recruiter for the most up-to-date information.